Detection of combined frequency and amplitude modulation. C, B., Moore, J., & Sek, A. Acoustical Society of America, 92:3119-3131, 1992. abstract bibtex This article is concerned with the detection of mixed modulation (MM), i.e., simultaneously occurring amplitude modulation (AM) and frequency modulation (FM). In experiment 1, an adaptive two-alternative forced-choice task was used to determine thresholds for detecting AM alone. Then, thresholds for detecting FM were determined for stimuli which had a fixed amount of AM in the signal interval only. The amount of AM was always less than the threshold for detecting AM alone. The FM thresholds depended significantly on the magnitude of the coexisting AM. For low modulation rates (4, 16, and 64 Hz), the FM thresholds did not depend significantly on the relative phase of modulation for the FM and AM. For a high modulation rate (256 Hz) strong effects of modulator phase were observed. These phase effects are as predicted by the model proposed by Hartmann and Hnath [Acustica 50, 297-312 (1982) ], which assumes that detection of modulation at modulation frequencies higher than the critical modulation frequency is based on detection of the lower sideband in the modulated signal's spectrum. In the second experiment, psychometric functions were measured for the detection of AM alone and FM alone, using modulation rates of 4 and 16 Hz. Results showed that, for each type of modulation, d' is approximately a linear function of the square of the modulation index. Application of this finding to the results of experiment 1 suggested that, at low modulation rates, FM and AM are not detected by completely independent mechanisms. In the third experiment, psychometric functions were again measured for the detection of AM alone and FM alone, using a 10-Hz modulation rate. Detectability was then measured for combined AM and FM, with modulation depths selected so that each type of modulation would be equally detectable if presented alone. Significant effects of relative modulator phase were found when detectability was relatively high. These effects were not correctly predicted by either a single-band excitation-pattern model or a multiple-band excitation-pattern model. However, the detectability of the combined AM and FM was better than would be predicted if the two types of modulation were coded completely independently.
@article{ BrianC1992,
abstract = {This article is concerned with the detection of mixed modulation (MM),
i.e., simultaneously occurring amplitude modulation (AM) and frequency
modulation (FM). In experiment 1, an adaptive two-alternative forced-choice
task was used to determine thresholds for detecting AM alone. Then,
thresholds for detecting FM were determined for stimuli which had
a fixed amount of AM in the signal interval only. The amount of AM
was always less than the threshold for detecting AM alone. The FM
thresholds depended significantly on the magnitude of the coexisting
AM. For low modulation rates (4, 16, and 64 Hz), the FM thresholds
did not depend significantly on the relative phase of modulation
for the FM and AM. For a high modulation rate (256 Hz) strong effects
of modulator phase were observed. These phase effects are as predicted
by the model proposed by Hartmann and Hnath [Acustica 50, 297-312
(1982) ], which assumes that detection of modulation at modulation
frequencies higher than the critical modulation frequency is based
on detection of the lower sideband in the modulated signal's spectrum.
In the second experiment, psychometric functions were measured for
the detection of AM alone and FM alone, using modulation rates of
4 and 16 Hz. Results showed that, for each type of modulation, d'
is approximately a linear function of the square of the modulation
index. Application of this finding to the results of experiment 1
suggested that, at low modulation rates, FM and AM are not detected
by completely independent mechanisms. In the third experiment, psychometric
functions were again measured for the detection of AM alone and FM
alone, using a 10-Hz modulation rate. Detectability was then measured
for combined AM and FM, with modulation depths selected so that each
type of modulation would be equally detectable if presented alone.
Significant effects of relative modulator phase were found when detectability
was relatively high. These effects were not correctly predicted by
either a single-band excitation-pattern model or a multiple-band
excitation-pattern model. However, the detectability of the combined
AM and FM was better than would be predicted if the two types of
modulation were coded completely
independently.},
added-at = {2012-01-27T14:10:42.000+0100},
author = {Brian C, J. Moore and Sek, Aleksander},
biburl = {http://www.bibsonomy.org/bibtex/26b8ca785c8d9bd26cd7494a83b44e583/muhe},
file = {Detection of combined frequency and amplitude modulation.pdf:1992\\Detection of combined frequency and amplitude modulation.pdf:PDF},
interhash = {6f5196bfcaa3263a741029c46762b249},
intrahash = {6b8ca785c8d9bd26cd7494a83b44e583},
journal = {Acoustical Society of America},
keywords = {Wahrnehmung Wirkung und},
owner = {Mu},
pages = {3119-3131},
pdf = {English\没什么用的\Detection of combined frequency and amplitude modulation.pdf},
title = {Detection of combined frequency and amplitude modulation},
volume = {92},
year = {1992}
}
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For low modulation rates (4, 16, and 64 Hz), the FM thresholds did not depend significantly on the relative phase of modulation for the FM and AM. For a high modulation rate (256 Hz) strong effects of modulator phase were observed. These phase effects are as predicted by the model proposed by Hartmann and Hnath [Acustica 50, 297-312 (1982) ], which assumes that detection of modulation at modulation frequencies higher than the critical modulation frequency is based on detection of the lower sideband in the modulated signal's spectrum. In the second experiment, psychometric functions were measured for the detection of AM alone and FM alone, using modulation rates of 4 and 16 Hz. Results showed that, for each type of modulation, d' is approximately a linear function of the square of the modulation index. Application of this finding to the results of experiment 1 suggested that, at low modulation rates, FM and AM are not detected by completely independent mechanisms. In the third experiment, psychometric functions were again measured for the detection of AM alone and FM alone, using a 10-Hz modulation rate. Detectability was then measured for combined AM and FM, with modulation depths selected so that each type of modulation would be equally detectable if presented alone. Significant effects of relative modulator phase were found when detectability was relatively high. These effects were not correctly predicted by either a single-band excitation-pattern model or a multiple-band excitation-pattern model. However, the detectability of the combined AM and FM was better than would be predicted if the two types of modulation were coded completely independently.","added-at":"2012-01-27T14:10:42.000+0100","author":["C, Brian","Moore, J.","Sek, Aleksander"],"author_short":["C, B.","Moore, J.","Sek, A."],"bibtex":"@article{ BrianC1992,\n abstract = {This article is concerned with the detection of mixed modulation (MM),\n\ti.e., simultaneously occurring amplitude modulation (AM) and frequency\n\tmodulation (FM). In experiment 1, an adaptive two-alternative forced-choice\n\ttask was used to determine thresholds for detecting AM alone. Then,\n\tthresholds for detecting FM were determined for stimuli which had\n\ta fixed amount of AM in the signal interval only. The amount of AM\n\twas always less than the threshold for detecting AM alone. The FM\n\tthresholds depended significantly on the magnitude of the coexisting\n\tAM. For low modulation rates (4, 16, and 64 Hz), the FM thresholds\n\tdid not depend significantly on the relative phase of modulation\n\tfor the FM and AM. For a high modulation rate (256 Hz) strong effects\n\tof modulator phase were observed. These phase effects are as predicted\n\tby the model proposed by Hartmann and Hnath [Acustica 50, 297-312\n\t(1982) ], which assumes that detection of modulation at modulation\n\tfrequencies higher than the critical modulation frequency is based\n\ton detection of the lower sideband in the modulated signal's spectrum.\n\tIn the second experiment, psychometric functions were measured for\n\tthe detection of AM alone and FM alone, using modulation rates of\n\t4 and 16 Hz. Results showed that, for each type of modulation, d'\n\tis approximately a linear function of the square of the modulation\n\tindex. Application of this finding to the results of experiment 1\n\tsuggested that, at low modulation rates, FM and AM are not detected\n\tby completely independent mechanisms. In the third experiment, psychometric\n\tfunctions were again measured for the detection of AM alone and FM\n\talone, using a 10-Hz modulation rate. Detectability was then measured\n\tfor combined AM and FM, with modulation depths selected so that each\n\ttype of modulation would be equally detectable if presented alone.\n\tSignificant effects of relative modulator phase were found when detectability\n\twas relatively high. These effects were not correctly predicted by\n\teither a single-band excitation-pattern model or a multiple-band\n\texcitation-pattern model. However, the detectability of the combined\n\tAM and FM was better than would be predicted if the two types of\n\tmodulation were coded completely \n\t\n\tindependently.},\n added-at = {2012-01-27T14:10:42.000+0100},\n author = {Brian C, J. 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